Quarterly report pursuant to sections 13 or 15(d)

Investment Properties - Additional Information (Detail)

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Investment Properties - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Property, Plant and Equipment [Line Items]        
Depreciation and amortization $ 184,933 $ 185,100 $ 556,452 $ 555,299
Subsidiaries [Member]
       
Property, Plant and Equipment [Line Items]        
Depreciation and amortization $ 132,748 $ 149,864 $ 393,004 $ 449,591